| 9-0.9= | 4.2÷0.01= | 1.5×0.04= | 12.5×1.4×0.8= |
| 0.48+1.2= | 0÷2.5= | 0.4×0.2= | 9.35-2.25-3.75= |
| 9-0.9=8.1 | 4.2÷0.01=420 | 1.5×0.04=0.06 | 12.5×1.4×0.8=14 |
| 0.48+1.2=1.68 | 0÷2.5=0 | 0.4×0.2=0.08 | 9.35-2.25-3.75=3.35 |
分析：本题据运算法则计算即可；其中12.5×1.4×0.8可据乘法交换律进行简算，9.35-2.25-3.75可据加法交换律及结合律进行简算．
点评：完成小数加减法时要注意小数点的对齐，完成乘除法时要注意小数点位置的变化．